Protecting-hood for spark-plugs.



R. W. BURNHAM. PROTECTING HOOD FOR SPARK PLUGS.

APPLIOATION FILED AUG. s, 1908.

Patented May 4, 1909.

Svwenfoz Z2 [V3242 'JZZQ Z louvre/aces RALPH W. BURNHAM, or OCEAN POINT, MAINE.

PROTECTING-HOOD FOR SPARK-PLUGS.

Specification of Lettera'Patent.

Patented May 4, 1909.

Application filed AugustB, 1908. Serial No. 446,713.

To all whom it may concern:

Be it known that I, RALPH W. BURNHAM, citizen of the United States, residing at Ocean Point, in the county of Lincoln and State of Maine; have invented certain new and useful Improvements in Protecting- Hoods for Spark-Plugs, of which the follow ing is a specification. v

The object of this invention is to provide a simple, durable and eflicient' device for protecting spark plugs of gasolene engines by rendering the same waterand moisture proof, and the invention consists in certain constructions, arrangements, and combinations of the parts that I shall hereinafter fully describe. i For a full understanding of the invention, reference is to be had to the following description and accompanying drawings in which:

Figure 1 is a perspective view of my improved protecting hood for spark plugs; and,

illustrating it applied.

Corresponding and like parts are referred to in the following descriptlon and indicated in all the views of the accompanying drawings by the same reference characters.

Referring to the drawings, the numeral 1 designates a spark plug of an .desired construction or design, formed wit the ordinary Fig. 2 is a longitudinal sectional View thereof exterior threads 2 by which it may be screwed into the wall of the engine cylinder. A designates my improved protecting hood which may be constructed of brass or any other metal ormaterial and which comprises acylindrical body portion 3 adapted to be slipped over the spark plug 1, the said body. portion being formed, in the present instance, intermediate its ends with interior threads 4 designed to e age the exterior threads 5 on the plug 1 so tiat the hood may be screwed thereon and securely held in place. It is to be particularly noted' that the hood 3 is provided in the lower end of its body ortionwith a lining 6 that may be formed of any suitable water proof material such ascork in one, two, or any number of layers as desired,.and the said body portion is similarly lined above or on the other side of the interior threads 4, as clearly illustrated in the drawing.

,8 designates a gasket of leather, rubber or the llke which is preferably interposed between the cylinder wall and the adjoining end of the body portion 3 of the hood. The l1ood'8 also embodies a tubular arm 9 which projects laterally from the body portion 3, and which is also preferably lined with cork or the like as indicated at 10, said arm being designed to receive the conductor '11 which may be slipped therein and 1d securely in place, the inner end of the conductor being secured to the binding post 12 of the spark plug. In order that the conductor may be securely attached to the terminal or. the binding post of the spark plug, and that the interior of the plug may be inspected at any time to determine whether or not a good connection has been efiected, the body portion of the head is provided at its outer end with a detachable cap 13 which, in thepresent instance, has screw threaded engagement therewith, and is provided with a lining 14 of cork or the like.

As-is well known, considerable difliculty has been experienced in spark plugs for gasolene engines. particularly in connection with motor 'boats, owing to the fact that waves splashing over the boat will often strike the mica washer of an'exposedplug and cause a short circuit and thereby often putting the. engine entirely out of commission unless the o erator happens to have an extra plug w 'chrnay be substituted for the dampened one. Not only is this contingency lia le to occur owing to the waves striking the motor boat, but in damp or foggy weather moisture is liable to collect upon the plug and also produce a short circuit. first of these contingencies mentioned might be avoided merely by covering the plug, but thesame would not hold good as to the efiectof moisture produced by rainy or foggy weather. And it'will be seen from the fore going description in connection with the accompanying drawin sthat by the provision It is obvious that the of waterproof or cor linings of the hood A,

"dampness will be obviated.

Having thus described the invention, what isclaimed as new is:

'1. A protecting hood for spark plugs embodying a cylindrical body poftion'adapted the body portion, the body portion and arm to he slipped over and incase a spark glug, being provided with Waterproof linings. 1

ody In testimony Wheneof I affix my signature and waterproofljnings secured in said v portion. 1n presonce of two witnesses.

5 2. Afprotecting hood for spark plu s en1-- RALPH W. BURNHAM.

bodying a cylindrical body portion a apted Witnesses; to be sli ped over and inoase a spark lug FRANK H. ALBEE, and a tu ular arm projecting laterally om O. W. BAKER. 

